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All Journal JURUTERA (Jurnal Umum Teknik Terapan)
Muhammad Azhari
Universitas Samudra
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Mechanical Engineering

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Numerical Study of Flow Characteristics Across Circular Cylinders and Sliced Cylinders of Type-D and Type-I Near Flat Walls Muhammad Azhari; Banta Cut; Nasruddin A. Abdullah
JURUTERA - Jurnal Umum Teknik Terapan Vol 13 No 01 (2026)
Publisher : Fakultas Teknik Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55377/jurutera.v13i01.13819

Abstract

Numerical simulations using the Ansys Fluent 2025 R2 CFD solver were conducted to investigate the unsteady and incompressible fluid flow characteristics around circular, D-type, and I-type cylinders positioned near a flat wall. The modified geometries for the D-type and I-type cylinders featured a cutting angle of 65°. This study evaluates the flow dynamics across various gap ratios (G/D) between the cylinders and the flat wall, specifically 0.05, 0.0833, and 0.1167. All simulations were performed at a Reynolds number (Re) of 5.3 using the k-SST turbulence model. The results indicate that decreasing the gap ratio triggers a significant blockage effect, characterized by flow acceleration (jetting) within the lower gap area. Qualitatively, increasing the G/D ratio is shown to delay flow separation and narrow the wake region. Visualizations of velocity and vorticity magnitude confirm that the interaction between the wall boundary layer and the cylinder's shear layer at small gaps inhibits organized vortex formation, although flow stability improves as the gap distance increases.
Co-Authors Banta Cut Nasruddin A. Abdullah